MEMBRANE LOOP PROCESS FOR SEPARATING CARBON DIOXIDE FOR USE IN GASEOUS FORM FROM FLUE GAS

摘要

The invention is a process involving membrane -based gas separation for separating and recovering carbon dioxide emissions from combustion processes in partially concentrated form, and then transporting the carbon dioxide and using or storing it (113) in a confined manner without concentrating it to high purity. The process of the invention involves building up the concentration of carbon dioxide in a gas flow loop between the combustion step (112) and a membrane separation step (111). A portion (107) of the carbon dioxide-enriched gas (106) can then be withdrawn from this loop and transported, without the need to liquefy the gas or otherwise create a high-purity stream, to a destination where it is used or confined, preferably in an environmentally benign manner.